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A reducer is used for reducing a set of elements.
Compat aliases for migration
See Migration guide for more details.
tf.data.experimental.Reducer( init_func, reduce_func, finalize_func )
A reducer is represented as a tuple of the three functions:
1) initialization function: key => initial state 2) reduce function: (old state, input) => new state 3) finalization function: state => result
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